中国实验快堆一回路冷阱工艺间钠火概率安全评价

Sodium Fire Probabilistic Safety Assessment of Primary Cold Trap Room for China Experimental Fast Reactor

本文运用事件树方法对中国实验快堆一回路冷阱工艺间发生钠火后的事故场景进行演绎分析,运用故障树方法对钠火相关系统进行可靠性建模。在此基础上计算得到各钠火事故序列的条件发生概率。结果表明:在获得的25个典型钠火事故序列中,19个序列的条件发生概率较低;在发生概率相对较高的6个序列中,4个序列的后果轻微,其余两个序列代表的钠火场景存在一定不确定性,需要在今后的钠火危险性评价中进一步具体研究。

The sodium fire scenarios after the fire was ignited in primary cold trap room of China Experimental Fast Reactor were deduced using event tree method.The systems related to the accident were modeled using fault tree method.Thereby,the conditional occurrence probabilities of all sodium fire sequences were calculated.The results show that 25 typical sodium fire accident sequences are obtained in total,and 19 sequences have lower probabilities of occurrence.Among the 6sequences with relatively higher probabilities,4sequences cause minor consequences,and the remaining 2sequences require a detailed hazard evaluation in the next work because of the uncertainty.